Join Date: May 2002
Location: Toronto, Rogers, 9865 & 8300-eHDD, Sharp LC75N8000U, Denon AVR4310Ci; Sony KDL40W3000, 9865
The (small amount) of oxidation will not harm the signal running through the cable itself. I usually leave about 6" extra and every couple of years, disconnect the wire, cut off 1/2" and reconnect - no more oxidation.
I routinely disconnect/reconnect all my cables and clean the contacts every year or two to prevent poor connections.
I believe that recommendation is at the end of the Digital Home FAQ "What you need to do to your new HDTV.